Anomalous fluorescence features of $Eu^{2+}$ in apatite-pyromorphite type matrices

Jagannathan, R and Kutty, TRN (1997) Anomalous fluorescence features of $Eu^{2+}$ in apatite-pyromorphite type matrices. In: Journal of Luminescence, 71 (2). pp. 115-121.

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Abstract

Divalent europium doped chloro-apatites, the well-known blue phosphor in high efficiency fluorescent lamps, exhibit anomalous fluorescence properties ascribed to photoionization process and the allied process. The photoionization properties of Eu2+-luminescent centre(s) in this system of materials has profound dependence on the chemical constituents of the matrix as exemplified by the diadochic substitution of (SiO4)(4-) for [(PO4)(3-) + Cl-]. The anomalous impurity trapped exciton emission can be better observed in Ba-compound than in the Ca- and Sr analogues, possibly due to the effect of the position of the conduction band.

Item Type:	Journal Article
Publication:	Journal of Luminescence
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Apatite;pyromorphite;phosphors;europium;photoluminescence.
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	06 Mar 2009 10:32
Last Modified:	19 Sep 2010 05:01
URI:	http://eprints.iisc.ac.in/id/eprint/18338

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